An approach based on frequency domain for random vibration fatigue life estimation

Abstract

According to the structural vibration fatigue characters, a life assessment method is presented. The method is based on the information of the frequency domain of random. Firstly, the frequency response of the structure analysis should be carried out by finite element analysis (FEA) under random vibration load, and the position and the stress response power spectral density (PSD) function can be obtained. Secondly, the life calculation model for the single-stage load is provided based on RC and LCC, and the cumulative damage for the structure on the multistage load can be obtained using Miner linear theory. Then the fatigue life of structure can be estimated under random vibration load. Lastly, a case of the life estimation method is presented.